Function that checks if the answers is valid

closed account (172v0pDG)
Basically I need some advice or walk through on trying to change this program I made up. The original is this one here
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#include <iostream>
#include <cctype>

using namespace std;

int function1( char arr[], int numberofgrades,char grades[], int whichgrade)
{
	int tally = 0;
	//for loop
	for(int i =0; i<numberofgrades; i++)
	{
		//if arr[i] == some grade
		switch (whichgrade)
		{
		case 1 : if(arr[i] == grades[0])
				 {
					 tally++;
					 
				 }
				 break;
		case 2 : if(arr[i] == grades[1])
				 {
					 tally++;
					 
				 }
				 break;
		case 3 : if(arr[i] == grades[2])
				 {
					 tally++;
					
				 }
				  break;
		case 4 : if(arr[i] == grades[3])
				 {
					 tally++;
					 
				 }
				 break;
		case 5 : if(arr[i] == grades[4])
				 {
					 tally++;
					 
				 }
				 break;
		}
	}
		return tally;
} 
	//
int main ()
{
	//step 1 ask the user for a number of grades less than or equal to 50

	
	int numberofgrades =0;
	char grades[50];
	char inputtedgrade;
	char possiblegrades[] = {'A', 'B', 'C', 'D', 'F'};
	bool tester;


	//verify the inputted grades
	do{
	cout << "Enter the number of grades you have to enter (less than or equal to 50)" ;
	cin >> numberofgrades;
	}while (numberofgrades <1 || numberofgrades >50);

	for(int k =0; k<numberofgrades; k++)
	{
		tester = (grades[k] == 'A') || (grades[k] == 'B') ||(grades[k] == 'C') || (grades[k] == 'D')||(grades[k] == 'F');
	
		do{
			cout << "Enter grade number " << k+1 << endl;
			cin >> inputtedgrade;
			grades[k] = toupper(inputtedgrade);
			tester = (grades[k] == 'A') || (grades[k] == 'B') ||(grades[k] == 'C') || (grades[k] == 'D')||(grades[k] == 'F');
		}while(!tester);
	}

	//char grades[]= {'E', 'B', 'B', 'A' ,'C', 'C', 'C', 'C','C' ,'C' ,'D', 'D','F', 'F','F','A'};
	
	//A = 3
	//B = 2
	//C = 6
	//D = 2
	//F = 3

	int talleyed[6];
	for(int j = 1; j<6; j++)
	{
		talleyed[j] = function1(grades,16, possiblegrades, j);
	}
	
	cout << "The number of As is " << talleyed[1] << endl;
	cout << "The number of Bs is " << talleyed[2] << endl;
	cout << "The number of Cs is " << talleyed[3] << endl;
	cout << "The number of Ds is " << talleyed[4] << endl;
	cout << "The number of Fs is " << talleyed[5] << endl;
	
		system("pause");
	return 0;
}



Basically I need to change it so instead of just normal letter grades it also excepts A+, A-, etc. but are inputted from a txt file, which I get how to use using ifstream, but I'm not sure about how to input that in, but I'm thinking I have to make another function to see if the grade is valid using it to search and sort the arrays with the main function, or at least that's what I think, If that's that case, I would like your guys input on this, and it would be greatly appreciated.
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